Skip to content
Country Dialing CodesA clearer way to call the world
AboutContact
Español — prefijos-telefonicos.comFrançais — indicatifs-telephoniques.net
US area code · Missouri

636 area code

Where the 636 area code is, its overlay and how to dial a +1 636 number from anywhere.

CoversBallwin, MissouriTime zoneCentral (CT)TypeGeographic
Quick answer

The 636 area code is in Ballwin, Missouri, United States (Central (CT)). To call from abroad: +1 636 555-0123.

StateMissouri
Main areaBallwin
Time zoneCentral (CT)
TypeGeographic
10-digit dialingNot required
In service since15-Apr-1999

The 636 area code is a geographic North American Numbering Plan (NANP) code covering Ballwin, Missouri. It has been in service since 15-Apr-1999 and sits in the Central (CT) time zone.

How to dial a 636 number

From abroad+1 636 555-0123
Within the US / Canada1 636 555-0123

Cities in the 636 area code

A 636 number is usually in one of these places in Missouri — 2 counties.

Ballwin Saint LouisChesterfield Saint LouisO'Fallon Saint CharlesSaint Charles Saint CharlesSaint Peters Saint CharlesWildwood

Other Missouri area codes

235314417557573660816975

Frequently asked questions

Where is the 636 area code?

The 636 area code is in Ballwin, Missouri, United States (Central (CT)).

Do I have to dial 10 digits for 636?

Local calls within 636 may use seven digits; ten-digit dialling always works.

How do I call a 636 number from another country?

Dial your exit code (or +), then 1, then 636, then the number: +1 636 555-0123.

Source: NANPA numbering plan. An area code covers a region, not a precise address — a 636 number does not pinpoint a street or ZIP code.

Number holders in area code 636

Each prefix (the three digits after the area code) is assigned by NANPA to one telephone company. 456 prefixes are in use in 636, shared by 34 companies. The largest holders:

CompanyPrefixesShare
Southwestern Bell11024%
Brightspeed Of Missouri, LLC4911%
Onvoy, LLC368%
T-Mobile USA, Inc.358%
Level 3 Communications, LLC296%
New Cingular Wireless PCS, LLC296%

Source: NANPA central office code assignments. A number keeps its original prefix when it is ported to another carrier.

Complaints about 636 numbers

Reports to the FTC, last 30 days
371
Recorded messages or robocalls
50%
Rank among area codes
#259 of 670
Most reported subjects
Other (210)
Medical & prescriptions (29)
Calls pretending to be government, businesses, or family and friends (27)

Period Aug 26 – Sep 24, 2026. These are the numbers shown on the caller ID of the reported calls; many are spoofed and do not belong to the real caller.

Source: US Federal Trade Commission, Do Not Call reported calls data (daily files).

All US area codes United States +1 Map of area code 636 — cities & rate centres

Explore by continent